From nobody Mon Feb 9 08:05:18 2026 Received: from mailgw.kylinos.cn (mailgw.kylinos.cn [124.126.103.232]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 553AD3AEF52; Thu, 22 Jan 2026 03:24:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=124.126.103.232 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769052268; cv=none; b=qitgPqgs4Aa74VJ/5ifRxid19tsNXSzjqkw7+o0mT0b71IC2l7qu70IcBrPqVNglPiTFklO+4rnY8xt5FtOJcmh4MZn7IO4sw8cpgqq1O5zQYPuViUsNxN5YWEgkR3P/PWbGSbycL/RTTHm0/ypvj2H8p1L5VSYc1OqKBWbZTT8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769052268; c=relaxed/simple; bh=IHt3QoFBpFtm67ho07WWIachXhji5tbdAbUQtgPYIsA=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=BjMB5/7uA3L/YIyJ6gGitalvzEJpWITy/Mo9ogaCZJTxuuBNaMH/Y95utFaWxfoMQMNE+bgICe4LoMYtcyAEBqAusAiZkQCq8NXq80FDKuOTBH88GiR4DDVBTvc2Mvhz8T6SssBxSVfTOcYwAuy+/NjjAGeuNAR0wArdE9Ows+c= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn; spf=pass smtp.mailfrom=kylinos.cn; arc=none smtp.client-ip=124.126.103.232 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=kylinos.cn X-UUID: d62a1c76f74111f0b0f03b4cfa9209d1-20260122 X-CTIC-Tags: HR_CC_COUNT, HR_CC_DOMAIN_COUNT, HR_CC_NAME, HR_CC_NO_NAME, HR_CTE_8B HR_CTT_MISS, HR_DATE_H, HR_DATE_WKD, HR_DATE_ZONE, HR_FROM_NAME HR_SJ_DIGIT_LEN, HR_SJ_LANG, HR_SJ_LEN, HR_SJ_LETTER, HR_SJ_NOR_SYM HR_SJ_PHRASE, HR_SJ_PHRASE_LEN, HR_SJ_WS, HR_TO_COUNT, HR_TO_DOMAIN_COUNT HR_TO_NO_NAME, IP_UNTRUSTED, SRC_UNTRUSTED, IP_UNFAMILIAR, SRC_UNFAMILIAR DN_TRUSTED, SRC_TRUSTED, SA_TRUSTED, SA_EXISTED, SN_TRUSTED SN_EXISTED, SPF_NOPASS, DKIM_NOPASS, DMARC_NOPASS, CIE_GOOD_SPF CIE_UNKNOWN, GTI_FG_BS, GTI_RG_INFO, GTI_C_BU, AMN_GOOD ABX_MISS_RDNS X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.3.6,REQID:7e321fd9-8414-4de1-98c0-e6c172e1d01d,IP:10,U RL:0,TC:0,Content:-5,EDM:0,RT:0,SF:-5,FILE:0,BULK:0,RULE:Release_Ham,ACTIO N:release,TS:0 X-CID-INFO: VERSION:1.3.6,REQID:7e321fd9-8414-4de1-98c0-e6c172e1d01d,IP:10,URL :0,TC:0,Content:-5,EDM:0,RT:0,SF:-5,FILE:0,BULK:0,RULE:Release_Ham,ACTION: release,TS:0 X-CID-META: VersionHash:a9d874c,CLOUDID:3aa29e557e2fbca1f38d3ccc574cf47a,BulkI D:260122112420TUBVNIWT,BulkQuantity:0,Recheck:0,SF:17|19|38|66|78|81|82|10 2|127|850|898,TC:nil,Content:0|15|50,EDM:-3,IP:-2,URL:0,File:nil,RT:nil,Bu lk:nil,QS:nil,BEC:nil,COL:0,OSI:0,OSA:0,AV:0,LES:1,SPR:NO,DKR:0,DKP:0,BRR: 0,BRE:0,ARC:0 X-CID-BVR: 2,SSN|SDN X-CID-BAS: 2,SSN|SDN,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR,TF_CID_SPAM_FAS,TF_CID_SPAM_FSD X-CID-RHF: D41D8CD98F00B204E9800998ECF8427E X-UUID: d62a1c76f74111f0b0f03b4cfa9209d1-20260122 X-User: tianyaxiong@kylinos.cn Received: from localhost.localdomain [(223.153.93.110)] by mailgw.kylinos.cn (envelope-from ) (Generic MTA) with ESMTP id 1884983693; Thu, 22 Jan 2026 11:24:18 +0800 From: Yaxiong Tian To: axboe@kernel.dk, rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Yaxiong Tian Subject: [PATCH 1/3] tracing: Export eval_map_wq for asynchronous use by other modules Date: Thu, 22 Jan 2026 11:24:15 +0800 Message-Id: <20260122032415.395548-1-tianyaxiong@kylinos.cn> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260122032051.386331-1-tianyaxiong@kylinos.cn> References: <20260122032051.386331-1-tianyaxiong@kylinos.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The eval_map_work_func() function, though queued in eval_map_wq, holds the trace_event_sem read-write lock for a long time during kernel boot. This causes blocking issues for other functions. Making eval_map_wq extern allows other modules to schedule their work asynchronously on this queue, preventing it from blocking the main boot thread. Signed-off-by: Yaxiong Tian --- kernel/trace/trace.c | 2 +- kernel/trace/trace.h | 2 ++ 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index e18005807395..cb073d0c86a6 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -10774,7 +10774,7 @@ int tracing_init_dentry(void) extern struct trace_eval_map *__start_ftrace_eval_maps[]; extern struct trace_eval_map *__stop_ftrace_eval_maps[]; =20 -static struct workqueue_struct *eval_map_wq __initdata; +struct workqueue_struct *eval_map_wq __initdata; static struct work_struct eval_map_work __initdata; static struct work_struct tracerfs_init_work __initdata; =20 diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index de4e6713b84e..44aaabc46a7a 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -770,6 +770,8 @@ extern unsigned long nsecs_to_usecs(unsigned long nsecs= ); =20 extern unsigned long tracing_thresh; =20 +extern struct workqueue_struct *eval_map_wq __initdata; + /* PID filtering */ =20 bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids, --=20 2.25.1 From nobody Mon Feb 9 08:05:18 2026 Received: from mailgw.kylinos.cn (mailgw.kylinos.cn [124.126.103.232]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 049383C1FD4; Thu, 22 Jan 2026 03:24:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=124.126.103.232 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769052277; cv=none; b=t1X0m3IaaOY3pRmNwsC2A9Bami07Uc5+6xV1OQvroPXAU9PjnV9YYzC4SIZsrGkuJKEc6aU/Nj1i8j22Xs2pfX2tIuksuHi/LnIqRBa4y4ygz+KHpY7/nPXs9anB7s4B3lzPTvxZn6/9YjETjINIZqUTzgKASVWpjFtmEZTPf1c= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769052277; c=relaxed/simple; bh=ovfcJNaAvlEHNIBw2CKhHl8WDsJ9RCmP/v+ASMhgg9M=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; 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Thu, 22 Jan 2026 11:24:29 +0800 From: Yaxiong Tian To: axboe@kernel.dk, rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Yaxiong Tian Subject: [PATCH 2/3] tracing/kprobes: Make setup_boot_kprobe_events() asynchronous Date: Thu, 22 Jan 2026 11:24:25 +0800 Message-Id: <20260122032425.396074-1-tianyaxiong@kylinos.cn> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260122032051.386331-1-tianyaxiong@kylinos.cn> References: <20260122032051.386331-1-tianyaxiong@kylinos.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" During kernel boot, the setup_boot_kprobe_events() function causes significant delays, increasing overall startup time. The root cause is a lock contention chain: its child function enable_boot_kprobe_events() requires the event_mutex, which is already held by early_event_add_tracer(). early_event_add_tracer() itself is blocked waiting for the trace_event_sem read-write lock, which is held for an extended period by trace_event_update_all(). To resolve this, we have moved the execution of setup_boot_kprobe_events() to the eval_map_wq workqueue, allowing it to run asynchronously. Signed-off-by: Yaxiong Tian --- kernel/trace/trace_kprobe.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index 9953506370a5..5e55a8fffd03 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -2031,6 +2031,13 @@ static __init int init_kprobe_trace_early(void) } core_initcall(init_kprobe_trace_early); =20 +static struct work_struct kprobe_trace_work __initdata; + +static void __init kprobe_trace_works_func(struct work_struct *work) +{ + setup_boot_kprobe_events(); +} + /* Make a tracefs interface for controlling probe points */ static __init int init_kprobe_trace(void) { @@ -2048,7 +2055,12 @@ static __init int init_kprobe_trace(void) trace_create_file("kprobe_profile", TRACE_MODE_READ, NULL, NULL, &kprobe_profile_ops); =20 - setup_boot_kprobe_events(); + if (eval_map_wq) { + INIT_WORK(&kprobe_trace_work, kprobe_trace_works_func); + queue_work(eval_map_wq, &kprobe_trace_work); + } else { + setup_boot_kprobe_events(); + } =20 return 0; } --=20 2.25.1 From nobody Mon Feb 9 08:05:18 2026 Received: from mailgw.kylinos.cn (mailgw.kylinos.cn [124.126.103.232]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1193334EF09; Thu, 22 Jan 2026 03:24:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=124.126.103.232 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769052289; cv=none; b=P5X6kj/xulIfzq4uSmqHdWnAFB1bfPAWuFPoxSNmyUyIUPYNdsj02XKPmyfYPodyXkcYn0gaNbRzgbXmGQR+juJZdsiLwi69/QscdVtoMGoaekzIFHK9Jm0DcAOwowkx6txC9kJzhHKelDd6PeVYVljA4YX2iVTD67YrZ05FGBc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769052289; c=relaxed/simple; bh=cyvNvbbt5DrLvCMB2E6ntXeUa64J32gE6ZzOEGN0YWY=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=rwacYu7VIXlBwgaOheZ1vpVLnNc+IVPYqXleYDv8FZ3cP95d6iUHndFFfgs65tM13PITCvimzZmd1sn50qj1KMLE3LNN81F/ws9ovSYupjLGkLKu0QVDSif2P9V2jaajtffZ4dSaTTVSyQQrHSBCR/aRMg6tHcvMzyVGh3AMl+A= ARC-Authentication-Results: i=1; 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Thu, 22 Jan 2026 11:24:41 +0800 From: Yaxiong Tian To: axboe@kernel.dk, rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Yaxiong Tian Subject: [PATCH 3/3] blktrace: Make init_blk_tracer() asynchronous Date: Thu, 22 Jan 2026 11:24:37 +0800 Message-Id: <20260122032437.396641-1-tianyaxiong@kylinos.cn> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260122032051.386331-1-tianyaxiong@kylinos.cn> References: <20260122032051.386331-1-tianyaxiong@kylinos.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The init_blk_tracer() function causes significant boot delay as it waits for the trace_event_sem lock held by trace_event_update_all(). Specifically, its child function register_trace_event() requires this lock, which is occupied for an extended period during boot. To mitigate this contention, we have moved init_blk_tracer() to the eval_map_wq workqueue, allowing it to execute asynchronously and prevent blocking the main boot thread. Signed-off-by: Yaxiong Tian --- kernel/trace/blktrace.c | 23 ++++++++++++++++++++++- 1 file changed, 22 insertions(+), 1 deletion(-) diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c index d031c8d80be4..dc205873c3b8 100644 --- a/kernel/trace/blktrace.c +++ b/kernel/trace/blktrace.c @@ -1832,7 +1832,9 @@ static struct trace_event trace_blk_event =3D { .funcs =3D &trace_blk_event_funcs, }; =20 -static int __init init_blk_tracer(void) +static struct work_struct blktrace_works __initdata; + +static int __init __init_blk_tracer(void) { if (!register_trace_event(&trace_blk_event)) { pr_warn("Warning: could not register block events\n"); @@ -1852,6 +1854,25 @@ static int __init init_blk_tracer(void) return 0; } =20 +static void __init blktrace_works_func(struct work_struct *work) +{ + __init_blk_tracer(); +} + +static int __init init_blk_tracer(void) +{ + int ret =3D 0; + + if (eval_map_wq) { + INIT_WORK(&blktrace_works, blktrace_works_func); + queue_work(eval_map_wq, &blktrace_works); + } else { + ret =3D __init_blk_tracer(); + } + + return ret; +} + device_initcall(init_blk_tracer); =20 static int blk_trace_remove_queue(struct request_queue *q) --=20 2.25.1